| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程研究所 === 102 === In 2014,the EPA of Taiwan announced new effluent discharge standards for the chemical industry.It is focus on the ammonia nitrogen in this new effluent discharge standards and ammonia nitrogen will be regulated in two stages.
In this study,we discussed the feasibility of using the MBR with traditional biological nitrification/denitrification process for treating coking wastewater.The coking wastewater contains high concentration COD,ammonia and SCN- a lot of refractory and toxic compounds in COD.Some people used denitrifition/nitrification process to treat the coking wastewater.Although COD and ammonia nitrogen concentration was from 2500 mg/L and 800 mg/L down to 250 mg/L and 30 mg/L,but the HRT need to 6~7 days.
This study using existing processing equipment –MBR in order to solve the problem of land area.The MBR is very useful to degrade the COD.It could be decreased from COD 2500 mg/L down to 200-500 mg/L,but could not remove a lot of ammonia nitrogen(remain 200-300 mg/L) from coking wastewater.
In lab scale,two reactors were started up for the continuous experiment.One is oxic (O)reactor for nitrification to convert ammonia to nitrate or nitrite.Another one is anoxic(A) reactor for denitrification to remove COD and convert nitrate to nitrogen.The continuous experiment results reveal that the ammonia nitroden concentration could be decrease from 200-300 mg/L down to lower 10 mg/L and ammonia conversion rate was higher than 90% when HRT were 6/13.2(A/O) hrs.It was confirmed that the feasibility of treating the coking wastewater by the MBR with biological nitrification/denitrification process.
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